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V6 (1994-2004) Mustangs Technical discussions on the 3.8L and 3.9L V6 torque monsters
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Old 02-19-2007, 01:32 PM   #1
asix
 
Join Date: May 2006
Posts: 12
Default DPFE sensor

Hey guys,
I've been having a problem with my 2004 manual v6 bucking when I let off the gas and sometimes almost stalling out when I come to a stop. It seemed to start when i put on my K&N Intake about a month ago but it could just be a coincidence. I thought it might have been my IAC valve soI replaced that and it didn't work. I have cleaned my MAF sensor and it still didnt help. I was thinking maybe it could be a problem with the DPFE sensor or EGR or something. What do you guys think. Any help is appreciated.
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Old 02-19-2007, 05:19 PM   #2
Baron von Munchausen
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Default RE: DPFE sensor

If nothing else works, consider re-installing your stock MAF screen (you'll have to be a little creative to do so). I would have said check for vacuum leaks, but you'vedone that already I'm sure.

TheDPFE sensor is said to be a weakness on sn95 Mustangs. I do not know what the symtoms are though of a bad one.
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Old 02-19-2007, 09:09 PM   #3
nappypalms
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Default RE: DPFE sensor

Is your Check Engine Light on? If so, go up to Autozone and have them scan it for ya.

Have you tried running any fuel injector cleaners or Seafoaming the engine?
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Old 02-19-2007, 09:58 PM   #4
asix
 
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Default RE: DPFE sensor

What will the MAF screen do? No my check engine light is not on. I have ran injector cleaner but not seafoam. Was thinking about it pretty soon though.
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Old 02-19-2007, 10:15 PM   #5
nappypalms
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Default RE: DPFE sensor

How many miles are on your Mustang?

Could need a tune-up (spark plugs/wires).
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Old 02-19-2007, 10:54 PM   #6
asix
 
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Default RE: DPFE sensor

Only about 40,000 miles.
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Old 02-20-2007, 12:21 AM   #7
asix
 
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Default RE: DPFE sensor

Im just curious. What does the MAF screen do anyways and why would it make a difference?
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Old 02-20-2007, 02:54 AM   #8
asix
 
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Default RE: DPFE sensor

Im pretty sure it has something to do with the DPFE sensor or the EGR system becauseI just unplugged the hose going to the EGR valve and whenI drove it around the problem seemed to go away.
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Old 02-20-2007, 12:27 PM   #9
cobra232
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Default RE: DPFE sensor

it's turbulence through the MAF. you either need to put a screen infront of the sensor or go back to the stock intake setup

if the screen doesn't work then try a straight filter mount to the MAF. It is a fender CAI correct? the 90 degree bend in CAI's are known to give turbulence at low speeds like at idle or coming up to a stop sign. too much turbulence and the meter gives incorrect fuel air demands and the car stumbles and stalls
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Old 02-20-2007, 04:21 PM   #10
v6kid07
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Default RE: DPFE sensor

symptoms of a bad one are having too much exhaust pressure because all it is. is an exhaust sensor lol i have replaced my dpfe with the new technology black one and the egr valve i replaced as well
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Old 02-20-2007, 04:21 PM
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